Fix caca backend build.

ui/ozone/platform/caca/ozone_platform_caca.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/ozone/platform/caca/ozone_platform_caca.h"
 
 #include "base/macros.h"
 #include "ui/events/ozone/layout/keyboard_layout_engine_manager.h"
 #include "ui/events/ozone/layout/no/no_keyboard_layout_engine.h"
 #include "ui/ozone/common/native_display_delegate_ozone.h"
@@ skipping 39 matching lines @@
   scoped_ptr<SystemInputInjector> CreateSystemInputInjector() override {
     return nullptr;  // no input injection support.
   }
   scoped_ptr<PlatformWindow> CreatePlatformWindow(
       PlatformWindowDelegate* delegate,
       const gfx::Rect& bounds) override {
     scoped_ptr<CacaWindow> caca_window(new CacaWindow(
         delegate, window_manager_.get(), event_source_.get(), bounds));
     if (!caca_window->Initialize())
       return nullptr;
-    return caca_window;
+    return std::move(caca_window);
   }
   scoped_ptr<NativeDisplayDelegate> CreateNativeDisplayDelegate() override {
     return make_scoped_ptr(new NativeDisplayDelegateOzone());
   }
   base::ScopedFD OpenClientNativePixmapDevice() const override {
     return base::ScopedFD();
   }
 
   void InitializeUI() override {
     window_manager_.reset(new CacaWindowManager);
@@ skipping 22 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(OzonePlatformCaca);
 };
 
 }  // namespace
 
 OzonePlatform* CreateOzonePlatformCaca() {
   return new OzonePlatformCaca;
 }
 
 }  // namespace ui